My snake's eyes are white, and he is not eating, do you think he is sick?
No, your snake is in the processes of shedding his skin (moulting). Unlike other animals that shed their skin in tiny flakes, reptiles shed entire sheets of skin in a process called ecdysis, a bit like a crab that moults its entire shell. This process is necessary for them to grow. Younger snakes shed every few weeks, while older snakes may only shed a few times per year.
Shedding often begins with the eyes becoming a cloudy blue-white colour as the 'eye cap', a protective scale, begins detaching from the eye such that it can be shed along with the rest of the skin. Soon, the rest of his skin will become dull, and he may become a bit nervous (as his vision is impaired), and he may hide more. Most snakes do not eat during a shed, and will try to find a rough surface to rub their skin on in order to dislodge the falling skin layer.
You can help your snake by ensuring he has some wooden branches or rocks to rub on, and by providing a humidity chamber or bowl of water to soak in. Lack of humidity in the cage can cause retained sheds, including the eye cap. Make sure your snake's eyes are bright and clear at the end of the moult.
Consult your veterinarian if your snake is unable to complete his shed within a few weeks, as it may be a sign of illness.